Ballpoint pen



FIG. 1 is the perspective view of a ballpoint pen showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is the top plan view thereof; and,

FIG. 7 is the bottom plan view thereof. 

The ornamental design for a ballpoint pen, as shown and described. 